NEC Safety Procedures & Code Compliance 2

Question 1

What is the minimum working clearance depth in front of electrical equipment rated 0-150V to ground operating at 600V or less, Condition 1?

Accepted Answer

3 feet

Answer

NEC Table 110.26(A)(1) requires 3 feet of clear working space for Condition 1 at 0-150V.

Question 2

Per NEC 110.26, what is the minimum headroom of working spaces about service equipment, switchboards, and panelboards?

Accepted Answer

6.5 feet

Answer

NEC 110.26(E) requires minimum 6.5 ft headroom or the height of the equipment, whichever is greater.

Question 3

What does a Ground-Fault Circuit Interrupter (GFCI) primarily protect against?

Accepted Answer

Electric shock to people

Answer

GFCIs protect people by quickly opening the circuit when ground-fault current is detected.

Question 4

At what level of ground-fault current does a Class A GFCI trip?

Accepted Answer

4-6 milliamps

Answer

A Class A GFCI trips at 4-6 mA of ground-fault current.

Question 5

Which color is required for the grounded (neutral) conductor of sizes 6 AWG or smaller per NEC 200.6?

Accepted Answer

White or gray

Answer

NEC 200.6 requires grounded conductors 6 AWG and smaller to be white or gray.

NEC Practice Test